povondraite
Sign in to saveAlso known as ferridravite, IMA1978-075, Pov
Povondraite is a rare silicate mineral from the tourmaline group with formula: NaFe3+3(Fe3+4,Mg2)(BO3)3Si6O18(OH)3O. It is a dark brown to black nearly opaque mineral with a resinous to splendent luster. It crystallizes in the trigonal crystal system as equant, distorted prisms with trigonal pyramid terminations.
Wikidata facts
- Subclass of
- tourmalines
- Image
- Povondraite-657308.jpg
Show 6 more facts
- crystal system
- trigonal crystal system
- IMA Mineral Symbol
- Pov
- Nickel-Strunz 9th edition (updated 2009)
- 9.CK.05
- Nickel-Strunz '10th ed', review of (9th ed/ 2009 update)
- 9.CK.05
- Commons category
- Povondraite
- chemical formula
- NaFe³⁺₃(Mg₂Fe³⁺₄)(Si₆O₁₈)(BO₃)₃(OH)₃O
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Encyclopedic overview
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Povondraite is a rare silicate mineral from the tourmaline group with formula: NaFe3+3(Fe3+4,Mg2)(BO3)3Si6O18(OH)3O. It is a dark brown to black nearly opaque mineral with a resinous to splendent luster. It crystallizes in the trigonal crystal system as equant, distorted prisms with trigonal pyramid terminations.
It occurs as rare fracture and cavity encrustations within schists derived from sedimentary rocks. Associated minerals include quartz, potassium feldspar, muscovite, schorl, riebeckite and magnesite.
Excerpted from Wikipedia’s “povondraite” article, available under the CC BY-SA 4.0 licence.